https://www.theatlantic.com/ideas/archive/2023/07/wealthy-liberal-suburbs-economic-segregation-scarsdale/674792/
When I first moved to the US I lived in Boulder County and observed this first hand, if anything it has become more pronounced.
I was driving yesterday listening to NPR and the author was on, quite fascinating, he confirmed my observations that those who shout DIE the loudest tend to be performative, it does seem that a lot of the Lawn Signs have disappeared for some reason.
Anyway if you want to listen here is the link. https://www.wbur.org/onpoint/2023/08/03/can-class-based-preferences-over-race-solve-our-countrys-equity-issues